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Old 01-16-2021, 11:55 PM
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W123, Is there a 4 piston Front Caliper in 1985?

I was looking in the brake bleeding area of the W123 Chassis FSM and there was this notation: "Attention!
The 4 piston fixed Caliper, Installed in September of 1985, has one vent screw inside and one vent screw outside. For venting the brake system or replacing the fluid, remove the front wheels so that the outer pressure chamber can be vented."

Is that The 4 piston fixed Caliper part of the Cars equipped with the ABS system or is it an error in the Manual? Or what?

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Old 01-17-2021, 12:46 AM
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September 1985 is VERY late in the W123 production life. I think the last US spec cars were built in August 1985 and some wagons were built until January 1986.
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Old 01-17-2021, 12:48 AM
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Quote:
Originally Posted by H-townbenzoboy View Post
September 1985 is VERY late in the W123 production life. I think the last US spec cars were built in August 1985 and some wagons were built until January 1986.
But, do you know if there is actually a thing as 4 piston front calipers for a W123? And do you know if they are only on models with ABS?
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Old 01-17-2021, 12:52 AM
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Originally Posted by Diesel911 View Post
But, do you know if there is actually a thing as 4 piston front calipers for a W123? And do you know if they are only on models with ABS?
I don't know, but ISPPI/EPC should be able to tell you.
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Old 01-17-2021, 08:51 AM
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There was. It was offered in some AMG tuned cars but gave way to the big brake upgrade.

Something tells me and always did there was a COTS solution which AMG seized upon
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Old 01-17-2021, 12:18 PM
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Thanks.
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Old 01-17-2021, 02:12 PM
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YW. I have never seen them, but I have heard folks talk about them a lot regarding the pre-merger cars. I suspect they were either Volvo or BMW applications which either bolted right on, OR reguired very little modification so that it was a simple fit without any engineering or any real effort. Over on STD.com there was tons of chatter about them around a decade ago; however, nothing ever materialized. Something tells me if a set would surface, then their true ID would surface. Then, it would be a rush on the remaining stocks.

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